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28ddbd4a86
In PR #79382, I need to add a new type that derives from ConstantArrayType. This means that ConstantArrayType can no longer use `llvm::TrailingObjects` to store the trailing optional Expr*. This change refactors ConstantArrayType to store a 60-bit integer and 4-bits for the integer size in bytes. This replaces the APInt field previously in the type but preserves enough information to recreate it where needed. To reduce the number of places where the APInt is re-constructed I've also added some helper methods to the ConstantArrayType to allow some common use cases that operate on either the stored small integer or the APInt as appropriate. Resolves #85124.
568 lines
19 KiB
C++
568 lines
19 KiB
C++
//= ScanfFormatString.cpp - Analysis of printf format strings --*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Handling of format string in scanf and friends. The structure of format
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// strings for fscanf() are described in C99 7.19.6.2.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/FormatString.h"
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#include "FormatStringParsing.h"
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#include "clang/Basic/TargetInfo.h"
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using clang::analyze_format_string::ArgType;
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using clang::analyze_format_string::FormatStringHandler;
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using clang::analyze_format_string::LengthModifier;
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using clang::analyze_format_string::OptionalAmount;
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using clang::analyze_format_string::ConversionSpecifier;
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using clang::analyze_scanf::ScanfConversionSpecifier;
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using clang::analyze_scanf::ScanfSpecifier;
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using clang::UpdateOnReturn;
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using namespace clang;
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typedef clang::analyze_format_string::SpecifierResult<ScanfSpecifier>
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ScanfSpecifierResult;
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static bool ParseScanList(FormatStringHandler &H,
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ScanfConversionSpecifier &CS,
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const char *&Beg, const char *E) {
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const char *I = Beg;
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const char *start = I - 1;
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UpdateOnReturn <const char*> UpdateBeg(Beg, I);
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// No more characters?
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if (I == E) {
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H.HandleIncompleteScanList(start, I);
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return true;
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}
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// Special case: ']' is the first character.
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if (*I == ']') {
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if (++I == E) {
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H.HandleIncompleteScanList(start, I - 1);
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return true;
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}
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}
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// Special case: "^]" are the first characters.
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if (I + 1 != E && I[0] == '^' && I[1] == ']') {
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I += 2;
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if (I == E) {
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H.HandleIncompleteScanList(start, I - 1);
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return true;
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}
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}
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// Look for a ']' character which denotes the end of the scan list.
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while (*I != ']') {
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if (++I == E) {
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H.HandleIncompleteScanList(start, I - 1);
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return true;
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}
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}
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CS.setEndScanList(I);
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return false;
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}
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// FIXME: Much of this is copy-paste from ParsePrintfSpecifier.
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// We can possibly refactor.
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static ScanfSpecifierResult ParseScanfSpecifier(FormatStringHandler &H,
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const char *&Beg,
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const char *E,
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unsigned &argIndex,
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const LangOptions &LO,
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const TargetInfo &Target) {
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using namespace clang::analyze_format_string;
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using namespace clang::analyze_scanf;
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const char *I = Beg;
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const char *Start = nullptr;
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UpdateOnReturn <const char*> UpdateBeg(Beg, I);
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// Look for a '%' character that indicates the start of a format specifier.
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for ( ; I != E ; ++I) {
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char c = *I;
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if (c == '\0') {
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// Detect spurious null characters, which are likely errors.
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H.HandleNullChar(I);
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return true;
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}
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if (c == '%') {
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Start = I++; // Record the start of the format specifier.
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break;
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}
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}
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// No format specifier found?
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if (!Start)
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return false;
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if (I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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ScanfSpecifier FS;
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if (ParseArgPosition(H, FS, Start, I, E))
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return true;
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if (I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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// Look for '*' flag if it is present.
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if (*I == '*') {
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FS.setSuppressAssignment(I);
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if (++I == E) {
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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}
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// Look for the field width (if any). Unlike printf, this is either
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// a fixed integer or isn't present.
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const OptionalAmount &Amt = clang::analyze_format_string::ParseAmount(I, E);
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if (Amt.getHowSpecified() != OptionalAmount::NotSpecified) {
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assert(Amt.getHowSpecified() == OptionalAmount::Constant);
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FS.setFieldWidth(Amt);
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if (I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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}
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// Look for the length modifier.
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if (ParseLengthModifier(FS, I, E, LO, /*IsScanf=*/true) && I == E) {
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// No more characters left?
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H.HandleIncompleteSpecifier(Start, E - Start);
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return true;
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}
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// Detect spurious null characters, which are likely errors.
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if (*I == '\0') {
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H.HandleNullChar(I);
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return true;
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}
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// Finally, look for the conversion specifier.
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const char *conversionPosition = I++;
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ScanfConversionSpecifier::Kind k = ScanfConversionSpecifier::InvalidSpecifier;
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switch (*conversionPosition) {
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default:
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break;
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case '%': k = ConversionSpecifier::PercentArg; break;
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case 'b': k = ConversionSpecifier::bArg; break;
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case 'A': k = ConversionSpecifier::AArg; break;
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case 'E': k = ConversionSpecifier::EArg; break;
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case 'F': k = ConversionSpecifier::FArg; break;
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case 'G': k = ConversionSpecifier::GArg; break;
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case 'X': k = ConversionSpecifier::XArg; break;
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case 'a': k = ConversionSpecifier::aArg; break;
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case 'd': k = ConversionSpecifier::dArg; break;
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case 'e': k = ConversionSpecifier::eArg; break;
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case 'f': k = ConversionSpecifier::fArg; break;
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case 'g': k = ConversionSpecifier::gArg; break;
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case 'i': k = ConversionSpecifier::iArg; break;
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case 'n': k = ConversionSpecifier::nArg; break;
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case 'c': k = ConversionSpecifier::cArg; break;
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case 'C': k = ConversionSpecifier::CArg; break;
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case 'S': k = ConversionSpecifier::SArg; break;
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case '[': k = ConversionSpecifier::ScanListArg; break;
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case 'u': k = ConversionSpecifier::uArg; break;
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case 'x': k = ConversionSpecifier::xArg; break;
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case 'o': k = ConversionSpecifier::oArg; break;
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case 's': k = ConversionSpecifier::sArg; break;
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case 'p': k = ConversionSpecifier::pArg; break;
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// Apple extensions
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// Apple-specific
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case 'D':
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if (Target.getTriple().isOSDarwin())
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k = ConversionSpecifier::DArg;
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break;
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case 'O':
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if (Target.getTriple().isOSDarwin())
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k = ConversionSpecifier::OArg;
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break;
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case 'U':
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if (Target.getTriple().isOSDarwin())
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k = ConversionSpecifier::UArg;
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break;
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}
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ScanfConversionSpecifier CS(conversionPosition, k);
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if (k == ScanfConversionSpecifier::ScanListArg) {
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if (ParseScanList(H, CS, I, E))
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return true;
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}
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FS.setConversionSpecifier(CS);
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if (CS.consumesDataArgument() && !FS.getSuppressAssignment()
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&& !FS.usesPositionalArg())
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FS.setArgIndex(argIndex++);
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// FIXME: '%' and '*' doesn't make sense. Issue a warning.
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// FIXME: 'ConsumedSoFar' and '*' doesn't make sense.
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if (k == ScanfConversionSpecifier::InvalidSpecifier) {
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unsigned Len = I - Beg;
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if (ParseUTF8InvalidSpecifier(Beg, E, Len)) {
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CS.setEndScanList(Beg + Len);
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FS.setConversionSpecifier(CS);
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}
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// Assume the conversion takes one argument.
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return !H.HandleInvalidScanfConversionSpecifier(FS, Beg, Len);
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}
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return ScanfSpecifierResult(Start, FS);
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}
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ArgType ScanfSpecifier::getArgType(ASTContext &Ctx) const {
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const ScanfConversionSpecifier &CS = getConversionSpecifier();
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if (!CS.consumesDataArgument())
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return ArgType::Invalid();
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switch(CS.getKind()) {
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// Signed int.
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case ConversionSpecifier::dArg:
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case ConversionSpecifier::DArg:
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case ConversionSpecifier::iArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(Ctx.IntTy);
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case LengthModifier::AsChar:
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return ArgType::PtrTo(ArgType::AnyCharTy);
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case LengthModifier::AsShort:
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return ArgType::PtrTo(Ctx.ShortTy);
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case LengthModifier::AsLong:
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return ArgType::PtrTo(Ctx.LongTy);
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case LengthModifier::AsLongLong:
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case LengthModifier::AsQuad:
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return ArgType::PtrTo(Ctx.LongLongTy);
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case LengthModifier::AsInt64:
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return ArgType::PtrTo(ArgType(Ctx.LongLongTy, "__int64"));
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case LengthModifier::AsIntMax:
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return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t"));
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case LengthModifier::AsSizeT:
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return ArgType::PtrTo(ArgType(Ctx.getSignedSizeType(), "ssize_t"));
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case LengthModifier::AsPtrDiff:
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return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"));
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case LengthModifier::AsLongDouble:
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// GNU extension.
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return ArgType::PtrTo(Ctx.LongLongTy);
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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case LengthModifier::AsInt32:
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case LengthModifier::AsInt3264:
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case LengthModifier::AsWide:
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case LengthModifier::AsShortLong:
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return ArgType::Invalid();
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}
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llvm_unreachable("Unsupported LengthModifier Type");
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// Unsigned int.
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case ConversionSpecifier::bArg:
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case ConversionSpecifier::oArg:
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case ConversionSpecifier::OArg:
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case ConversionSpecifier::uArg:
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case ConversionSpecifier::UArg:
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case ConversionSpecifier::xArg:
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case ConversionSpecifier::XArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(Ctx.UnsignedIntTy);
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case LengthModifier::AsChar:
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return ArgType::PtrTo(Ctx.UnsignedCharTy);
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case LengthModifier::AsShort:
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return ArgType::PtrTo(Ctx.UnsignedShortTy);
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case LengthModifier::AsLong:
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return ArgType::PtrTo(Ctx.UnsignedLongTy);
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case LengthModifier::AsLongLong:
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case LengthModifier::AsQuad:
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return ArgType::PtrTo(Ctx.UnsignedLongLongTy);
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case LengthModifier::AsInt64:
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return ArgType::PtrTo(ArgType(Ctx.UnsignedLongLongTy, "unsigned __int64"));
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case LengthModifier::AsIntMax:
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return ArgType::PtrTo(ArgType(Ctx.getUIntMaxType(), "uintmax_t"));
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case LengthModifier::AsSizeT:
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return ArgType::PtrTo(ArgType(Ctx.getSizeType(), "size_t"));
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case LengthModifier::AsPtrDiff:
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return ArgType::PtrTo(
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ArgType(Ctx.getUnsignedPointerDiffType(), "unsigned ptrdiff_t"));
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case LengthModifier::AsLongDouble:
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// GNU extension.
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return ArgType::PtrTo(Ctx.UnsignedLongLongTy);
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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case LengthModifier::AsInt32:
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case LengthModifier::AsInt3264:
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case LengthModifier::AsWide:
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case LengthModifier::AsShortLong:
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return ArgType::Invalid();
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}
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llvm_unreachable("Unsupported LengthModifier Type");
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// Float.
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case ConversionSpecifier::aArg:
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case ConversionSpecifier::AArg:
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case ConversionSpecifier::eArg:
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case ConversionSpecifier::EArg:
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case ConversionSpecifier::fArg:
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case ConversionSpecifier::FArg:
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case ConversionSpecifier::gArg:
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case ConversionSpecifier::GArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(Ctx.FloatTy);
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case LengthModifier::AsLong:
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return ArgType::PtrTo(Ctx.DoubleTy);
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case LengthModifier::AsLongDouble:
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return ArgType::PtrTo(Ctx.LongDoubleTy);
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default:
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return ArgType::Invalid();
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}
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// Char, string and scanlist.
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case ConversionSpecifier::cArg:
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case ConversionSpecifier::sArg:
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case ConversionSpecifier::ScanListArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(ArgType::AnyCharTy);
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case LengthModifier::AsLong:
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case LengthModifier::AsWide:
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return ArgType::PtrTo(ArgType(Ctx.getWideCharType(), "wchar_t"));
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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return ArgType::PtrTo(ArgType::CStrTy);
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case LengthModifier::AsShort:
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if (Ctx.getTargetInfo().getTriple().isOSMSVCRT())
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return ArgType::PtrTo(ArgType::AnyCharTy);
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[[fallthrough]];
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default:
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return ArgType::Invalid();
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}
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case ConversionSpecifier::CArg:
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case ConversionSpecifier::SArg:
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// FIXME: Mac OS X specific?
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switch (LM.getKind()) {
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case LengthModifier::None:
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case LengthModifier::AsWide:
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return ArgType::PtrTo(ArgType(Ctx.getWideCharType(), "wchar_t"));
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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return ArgType::PtrTo(ArgType(ArgType::WCStrTy, "wchar_t *"));
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case LengthModifier::AsShort:
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if (Ctx.getTargetInfo().getTriple().isOSMSVCRT())
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return ArgType::PtrTo(ArgType::AnyCharTy);
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[[fallthrough]];
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default:
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return ArgType::Invalid();
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}
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// Pointer.
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case ConversionSpecifier::pArg:
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return ArgType::PtrTo(ArgType::CPointerTy);
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// Write-back.
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case ConversionSpecifier::nArg:
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switch (LM.getKind()) {
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case LengthModifier::None:
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return ArgType::PtrTo(Ctx.IntTy);
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case LengthModifier::AsChar:
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return ArgType::PtrTo(Ctx.SignedCharTy);
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case LengthModifier::AsShort:
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return ArgType::PtrTo(Ctx.ShortTy);
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case LengthModifier::AsLong:
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return ArgType::PtrTo(Ctx.LongTy);
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case LengthModifier::AsLongLong:
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case LengthModifier::AsQuad:
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return ArgType::PtrTo(Ctx.LongLongTy);
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case LengthModifier::AsInt64:
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return ArgType::PtrTo(ArgType(Ctx.LongLongTy, "__int64"));
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case LengthModifier::AsIntMax:
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return ArgType::PtrTo(ArgType(Ctx.getIntMaxType(), "intmax_t"));
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case LengthModifier::AsSizeT:
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return ArgType::PtrTo(ArgType(Ctx.getSignedSizeType(), "ssize_t"));
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case LengthModifier::AsPtrDiff:
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return ArgType::PtrTo(ArgType(Ctx.getPointerDiffType(), "ptrdiff_t"));
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case LengthModifier::AsLongDouble:
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return ArgType(); // FIXME: Is this a known extension?
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case LengthModifier::AsAllocate:
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case LengthModifier::AsMAllocate:
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case LengthModifier::AsInt32:
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case LengthModifier::AsInt3264:
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case LengthModifier::AsWide:
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case LengthModifier::AsShortLong:
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return ArgType::Invalid();
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}
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default:
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break;
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}
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return ArgType();
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}
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bool ScanfSpecifier::fixType(QualType QT, QualType RawQT,
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const LangOptions &LangOpt,
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ASTContext &Ctx) {
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// %n is different from other conversion specifiers; don't try to fix it.
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if (CS.getKind() == ConversionSpecifier::nArg)
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return false;
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if (!QT->isPointerType())
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return false;
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QualType PT = QT->getPointeeType();
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// If it's an enum, get its underlying type.
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if (const EnumType *ETy = PT->getAs<EnumType>()) {
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// Don't try to fix incomplete enums.
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if (!ETy->getDecl()->isComplete())
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return false;
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PT = ETy->getDecl()->getIntegerType();
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}
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const BuiltinType *BT = PT->getAs<BuiltinType>();
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if (!BT)
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return false;
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// Pointer to a character.
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if (PT->isAnyCharacterType()) {
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CS.setKind(ConversionSpecifier::sArg);
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if (PT->isWideCharType())
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LM.setKind(LengthModifier::AsWideChar);
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else
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LM.setKind(LengthModifier::None);
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// If we know the target array length, we can use it as a field width.
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if (const ConstantArrayType *CAT = Ctx.getAsConstantArrayType(RawQT)) {
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if (CAT->getSizeModifier() == ArraySizeModifier::Normal)
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FieldWidth = OptionalAmount(OptionalAmount::Constant,
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CAT->getZExtSize() - 1, "", 0, false);
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}
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return true;
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}
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// Figure out the length modifier.
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switch (BT->getKind()) {
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// no modifier
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case BuiltinType::UInt:
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case BuiltinType::Int:
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case BuiltinType::Float:
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LM.setKind(LengthModifier::None);
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break;
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// hh
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case BuiltinType::Char_U:
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case BuiltinType::UChar:
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case BuiltinType::Char_S:
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case BuiltinType::SChar:
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LM.setKind(LengthModifier::AsChar);
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break;
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// h
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case BuiltinType::Short:
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case BuiltinType::UShort:
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LM.setKind(LengthModifier::AsShort);
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break;
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// l
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case BuiltinType::Long:
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case BuiltinType::ULong:
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case BuiltinType::Double:
|
|
LM.setKind(LengthModifier::AsLong);
|
|
break;
|
|
|
|
// ll
|
|
case BuiltinType::LongLong:
|
|
case BuiltinType::ULongLong:
|
|
LM.setKind(LengthModifier::AsLongLong);
|
|
break;
|
|
|
|
// L
|
|
case BuiltinType::LongDouble:
|
|
LM.setKind(LengthModifier::AsLongDouble);
|
|
break;
|
|
|
|
// Don't know.
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
// Handle size_t, ptrdiff_t, etc. that have dedicated length modifiers in C99.
|
|
if (LangOpt.C99 || LangOpt.CPlusPlus11)
|
|
namedTypeToLengthModifier(PT, LM);
|
|
|
|
// If fixing the length modifier was enough, we are done.
|
|
if (hasValidLengthModifier(Ctx.getTargetInfo(), LangOpt)) {
|
|
const analyze_scanf::ArgType &AT = getArgType(Ctx);
|
|
if (AT.isValid() && AT.matchesType(Ctx, QT))
|
|
return true;
|
|
}
|
|
|
|
// Figure out the conversion specifier.
|
|
if (PT->isRealFloatingType())
|
|
CS.setKind(ConversionSpecifier::fArg);
|
|
else if (PT->isSignedIntegerType())
|
|
CS.setKind(ConversionSpecifier::dArg);
|
|
else if (PT->isUnsignedIntegerType())
|
|
CS.setKind(ConversionSpecifier::uArg);
|
|
else
|
|
llvm_unreachable("Unexpected type");
|
|
|
|
return true;
|
|
}
|
|
|
|
void ScanfSpecifier::toString(raw_ostream &os) const {
|
|
os << "%";
|
|
|
|
if (usesPositionalArg())
|
|
os << getPositionalArgIndex() << "$";
|
|
if (SuppressAssignment)
|
|
os << "*";
|
|
|
|
FieldWidth.toString(os);
|
|
os << LM.toString();
|
|
os << CS.toString();
|
|
}
|
|
|
|
bool clang::analyze_format_string::ParseScanfString(FormatStringHandler &H,
|
|
const char *I,
|
|
const char *E,
|
|
const LangOptions &LO,
|
|
const TargetInfo &Target) {
|
|
|
|
unsigned argIndex = 0;
|
|
|
|
// Keep looking for a format specifier until we have exhausted the string.
|
|
while (I != E) {
|
|
const ScanfSpecifierResult &FSR = ParseScanfSpecifier(H, I, E, argIndex,
|
|
LO, Target);
|
|
// Did a fail-stop error of any kind occur when parsing the specifier?
|
|
// If so, don't do any more processing.
|
|
if (FSR.shouldStop())
|
|
return true;
|
|
// Did we exhaust the string or encounter an error that
|
|
// we can recover from?
|
|
if (!FSR.hasValue())
|
|
continue;
|
|
// We have a format specifier. Pass it to the callback.
|
|
if (!H.HandleScanfSpecifier(FSR.getValue(), FSR.getStart(),
|
|
I - FSR.getStart())) {
|
|
return true;
|
|
}
|
|
}
|
|
assert(I == E && "Format string not exhausted");
|
|
return false;
|
|
}
|